I drilled out the stuck bleeder, not full width nor depth, then hit it
with heat hoping the "shell" of the drilled out bleeder would come
away from the caliper body. No dice. So i progressively drilled more
and and ran a tap down the hole to clean up threads, but I damaged the
conical end of the bleeder hole.

So with new bleeder installed it does not seal. What a bummer.

Thanks to all that offered replacement calipers, but it seems that my
local wrecker has a few pairs on hand and I need the brakes to be
fixed ASAP.

I'll keep the old set and see, sometime, if I can't drill out larger
hole and tap for an insert and a different bleeder.

alistair